S.P. S.P. - 1 year ago 72
Objective-C Question

Get image width and height before loading it completely in iPhone

I am loading an image in my UITableViewCell using

[NSData dataWithContentsOfURL:imageUrl]

For setting custom height for my tableview cell , i need the actual size of the image that am loading.

Can we get the width and height of an image before loading it completely ? Thanks in advance.

Answer Source

NSData is an "opaque" data, so you cannot do much with it before converting it to something more "useful" (e.g., creating an UIImage by means of it -initWithData: method). At that moment you could enquiry the image size, but it would be late for you.

The only approach I see, if you really need knowing the image size before the image is fully downloaded, is implementing a minimal server-side API so that you can ask for the image size before trying to download it.

Anyway, why do you need to know the image size before it is actually downloaded? Could you not set the row height at the moment when it has been downloaded (i.e., from your request delegate method)?

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